Elevator.



T. P. FORD.

ELEVATOR.

APPLICATION FILED NOV. 25. 19l6.

WITNESSES .4 TTOR/VEVS THOMAS 1?. FORD, OF BROOKLYN, NEW YORK.

ELEVATOR.

Specification of Letters Yatent.

Patented Apr. 241, 1917.

Application filed November 25, 1916. Serial No. 133,323. 1

To all whom it may concern:

Be it known that 1, Thomas P. FORD, a citizen of the United States, anda resident of the city of New York, borough of Brooklyn, in the countyof Kings and State of New York, have invented new and usefulimprovements in Elevators, of which the following is a full, clear, andexact description.

The object of the invention is to provide certain new and usefulimprovements in elevators, arranged to prevent, the operator of the carfrom starting the latter after stopping at any one of the landingsunless both the shaft door and the car door are in closed position, thusinsuring safety to the passengers going in and out of the car.

In order to accomplish the desired result, use is made of a lockingdevice for the controlling mechanism of the car to lock the controllingmechanism at the time the car is at a standstill at a landing and thecar door and the shaft door are both open, the said locking devicemoving bodily sidewise with the said cardoor and being adapted to movetransversely when released by the said shaft door to partly disengagethe said locking device from the controlling mechanism on closing theshaft door, and to completely disengage the locking device from thecontrolling mechanism on closing the car door.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification, in whichsimilar characters of reference inclicate corresponding parts in all theviews.

Figure 1 is an enlarged sectional side elevation of the elevator showinga car at the landing and with the car door and the shaft door in openposition and the controlling mechanism of the car locked againstmovement;

Fig. 2 is a similar view of the same with the car door and the shaftdoor in closed position and the controlling mechanism unlocked and inrunning position;

Fig. 3 is an enlarged side elevation of the controlling mechanism, thelocking device and a portion of the car door to which the locking deviceisattached, the controlling device being in locked position;

Fig. 1 is a sectional plan view of the same on the line 44 of Fig. 8;

Fig. 5 is a similar view of the same with the shaft door closed and thecar door open;

Fig. 6 is a similar view of the same with both the shaft door and thecar door closed; and

Fig. 7 is a similar view of the same with the car door closed and theshaft door open.

The up and down movement of the elevator car 10 in the shaft 11 iscontrolled by the usual controlling device 12 having a disk 13 providedwith a handle 14 under the control of the attendant of the car 10 tostart and stop the car in the usual manner. fhe disk 13 is provided witha slot 15 which extends horizontally on the right-hand side of thelandings. The car 10 is provided with a door 16, preferably in the formof a gate of the lazy tong type, and mounted to slide, to open and closethe car door opening 17, and which latter is adapted to register with asimilar opening 18 at each landing 19. The opening 18 is adapted to beopened and closed by an elevator shaft door 20 adapted to be moved intoopen or closed position in the usual manner by the attendant of the car.

In order to prevent the controlling disk 13 from being turned fromnormal stopping position into running position at the time a car is atrest at a landing and both or either door 17 or 20 is in open position alocking device is provided presently described in detail. The lockingdevice consists essentially of a bolt or projection 25 adapted to engagethe slot 15 and the said bolt 25.-is attached at its back to the freeend of a spring arm 26 secured to one of the lazy tong members 27 of thecar door 16. The lazy tong member 27 is preferably the one next thefixed member of the door 16 so that when the latter is moved into anopen position the member 27 moves a short distance but a distancesuflicient to move the front end 28 of the bolt 25 out of engagementwith the slot 15. The spring arm 26 is provided with a hump 29 adaptedto be engaged by a fixed member 80 of the shaft door 20 at the time theshaft door moves into open position to cause the spring arm 26 to moveinwardly with a view to engage the bolt 25 with the slot 15.

The bolt 25 is provided on its left-hand side with an enlargement 31which remains in engagement with the slot 15 at the time the bolt 25 ismoved from the left to the right on closing the car door 16, but whenthe shaft door 20 is moved into closed position then the member 30thereof disengages the hump 29 and allows the spring arm 26 to swingback by its own resiliency to normal position thus disengagingtheenlarged portion 31 from the slot 15.

The operation is as follows:

Presuming that the car is reaching a landing and is stopped by theattendant of the car turning the disk 13 to stopping position so thatthe slot 15 extends horizontally, as previously explained: Now, when theoperator opens the car door 16 then the bolt 25 is moved to the left andengages with its free end 28 the slot 15 so that the disk 13 is lockedagainst turning as long as the car door 16 is in open position. When theattendant next opens the shaft door then the member 30 thereof moves inengagement with the hump 29 and in doing so swings the arm 26 inward toengage the enlarged portion 31 of the bolt with the slot 15. When theattendant intends to start the car it is necessary for him to close boththe shaft door 20 and the car door 16. When the attendant closes theshaft door 20 then the member 30 thereof moves out of engagement withthe hump 29 to allow the spring arm 26 to move outward until theenlarged portion 31 of the bolt 25 is out of engagement with the slot 15but the free end 28 of the bolt 25 is still in engagement with the slot15 (see Fig. When v the attendant next closes the car door 16 then thebolt 25 is moved bodily from the left to the right until the free end 28is out of engagement with the slot 15 (see Fig. 6). The disk 13 is nowunlocked and the attendant can turn the same to start the car.

In case the attendant should forget to close the shaft door 20 and onlyclose the car door 16 then the bolt 25 is moved from the left to theright until its free end 28 clears the slot 15 but the enlarged portion31 still engages the slot 15 (see Fig. 7 and thus prevents the disk 13from being turned.

It isunderstood that as long as the shaft door 20 is in open positionthe bolt 25 is held in inward position by the action of the shaft doormember 30 engaging the hump 29.

From the foregoing it will be seen that by the simple means described,the car after having been stopped at a landing cannot be started unlessboth the shaft door 20 and the car door 16 are in closed position, thusinsuring safety to the passengers going in or out of the car.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. In an elevator, the combination of a car, a car-controlling mechanismtherefor, a shaft door, a car door, and a locking device for the saidcontrolling mechanism, the said locking device having means to lock thecontrolling mechanism at the time the car is at a standstill at alanding, and the car door and the shaft door are open, the said lockingdevice being attached to the said car door to move bodily sidewise withthe car door on opening and closing the latter, the said locking deviceand the said shaft door having coacting means to hold the locking devicein locking position while the shaft door is open and to allow thelooking device to move transversely into a partly unlocking positionrelative to the said controlling mechanism on being released by theshaft door on closing the latter, the said locking device beingcompletely disengaged from the controlling mechanism on closing the cardoor.

2. In an elevator, the combination of a car having a car door, a shaftdoor, a carcontrolling mechanism, and a bolt engaging the saidcar-controlling mechanism at the time the caris at a landing and thesaid car door and the said shaft door are open, the said bolt beingcarried by the said car door to move bodily with the car door on openingand closing the latter, the said bolt and the said shaft door havingcoacting means to move the bolt transversely in one direction and thesaid bolt having means to move it transversely in the opposite directionon being released by the shaft door on closing the latter.

3. In an elevator, the combination of a car, a car-controlling mechanismfor the same, a shaft door, a car door, and a bolt adapted to engage andlock the said controlling mechanism, the bolt having a spring armattached to the said car door to move the said bolt sidewise on openingand closing the car door, the said bolt being capable to movetransversely in one direction by the resiliency of its spring arm andthe said spring arm of the bolt and the said shaft door having coactingmeans to move the bolt transversely in the opposite direction on closingthe said shaft door, the said bolt being held in looking position by thecoaction of both the car door and the shaft door at the time the doorsare in open position.

and the said bolt moving into open position and out of engagement withthe said controlling mechanism on the closing of both doors.

4L. In an elevator, a car-controlling mechanism for the car and having adisk provided with a slot, a bolt having a shoulder and adapted toengage the said slot, and a spring arm carrying the said bolt andattached to the car door to move sidewise with ,7

the latter, the said spring arm having a hump adapted to be engaged bythe shaft door.

THOMAS P. FORD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

